I had success with ezinearticles.com. I redirected the user to my own site with the affiliate links, as ezinearticles does not allow anymore any direct aff links.

At the end of the day, a quality ezine that gets views and is properly targeted for your keywords is a considerable effort, and since content is king you are better off putting it on your own blog. This way you will get the google juice instead of an article site.

I would not base a business model on article marketing for sure. It is nice to play with, but not a long term solution. Even article sites can get Google penalties, etc.